Abstract: By means of a curing process combining thermal and UV curing it is possible, using compositions comprising (A) a coating system based on a polyacrylate polyol or polyester polyol with melamine, or a polyacrylate polyol and/or polyester polyol with a blocked or unblocked polyisocyanate, or a carboxyl-, anhydride- or amino-functional polyester and/or polyacrylate with an epoxy-functional polyester or polyacrylate, (B) an OH—, NH2—, COOH—, epoxy- or NCO-functional resin containing, in addition, at least one ethylenically unsaturated double bond, which is separated from the functional group by a spacer group, and (C) at least one photoinitiator, to obtain coatings having good surface properties.

Abstract: A multilayer circuit board having a resolution in the range of 25-80 &mgr;m, and blind via-holes between layers, the blind via-holes having an aspect ratio in the range of 2.0-0.6 for effecting access between the layers, wherein an insulating layer having the blind via-holes between the layers has a glass transition temperature in the range of 150-220° C., and an epoxy group photosensitive resin composition is used therefor. A photosensitive resin composition having a preferable resolution and heat resistance is obtained. A multilayer circuit board is provided in which the thermal stress generated in the steps of a reflow process, a gold wire bonding process and a repairing process in a bare chip mounting process are reduced, and peeling off of the conductor wiring and deformation of the multilayer circuit board caused by mechanical stresses during the heating processes are suppressed. Accordingly, a decrease in the size and weight of an electronic apparatus is possible.

Abstract: Disclosed is an ultraviolet-curable cellulosic coating composition comprising cellulose acetate, diepoxy compound and photo cationic polymerization catalyst. The objective is to provide a novel ultraviolet-curable cellulosic coating composition capable of forming a film excellent in the adherence to polar substrate, solvent resistance, gloss and impact resistance.

Abstract: A compound for use as a nematic phase in cholesteric liquid polymers of the general formula C—Am, and a production process.

Abstract: The invention concerns a novel method for preparing non-toxic resins crosslinkable under radiation in the presence of an initiator system. Said resins are prepared from compositions of an organic and/or silicon type comprising monomers, oligomers and/or polymers with organofunctional groups, and are cross-linked in the presence of an initiator system consisting of an onium salt with low toxicity whereof the cationic structure is [(CH(CH3)2—C6H4—)—I—(—R1)]+(I).

Abstract: This invention discloses compositions adapted to produce, through solid imaging means, excellent quality objects having material properties that simulate the look and feel of polyethylene articles.

Abstract: The present invention relates to a photocurable liquid resin composition comprising: (A) a cationically polymerizable organic compound; (B) a cationic photopolymerization initiator; (C) an ethylenically unsaturated monomer; (D) a radical photopolymerization initiator; (E) a polyether polyol compound having one or more hydroxyl groups in one molecule; and, optionally, includes elastomer particles having a specific particle diameter and/or an epoxy-branched alicyclic compound.

Abstract: Solvent-free, energy curable flexographic printing inks which contain a pigment; a rheological additive having the structure P-(U-Y)s, wherein P is the residue of an organic pigment or dye, Y is a polyalkylene oxide moiety, U is a linking moiety covalently bonding Y to P and s is an integer from 1 to 3; and an energy curable liquid vehicle which may be a ultraviolet cationic or a free radical initiated polymerization system, cured by actinic radiation; and optionally containing a photoinitiating system.

Abstract: A method of accelerating the cure rate of an epoxy curing composition includes combining a cycloaliphatic epoxyalcohol monomer, a non-hydroxyl-containing epoxy monomer and a cationic photoinitiator to form an epoxy curing composition, and exposing the curing composition to a source of radiation. The resulting polymers and copolymers are branched polyethers containing hydroxyl functionality.

Abstract: Accelerators that can be useful for an energy polymerizable composition comprising a cationically curable material; energy polymerizable compositions comprising at least one cationically curable material and an initiation system therefor, the initiation system comprising at least one organometallic complex salt and at least one accelerator; and a method for curing the compositions. The cured compositions can provide useful articles. The invention also provides compositions of matter comprising an organometallic complex salt and at least one compound selected from the Class 1 and Class 2 compounds disclosed herein.

Abstract: Compositions for producing replicated optical components are disclosed. A composition for making a large scale submaster optical component includes a mixture having an acrylated aliphatic urethane oligomer/monomer blend and a tripropylene glycol diacrylate. The mixture is combined with a number of other components including an isobornyl acrylate, an ultraviolet polymerizing varnish, a surfactant, and a photoinitiator. A composition for making a large scale replica optical component includes a mixture having an acrylated aliphatic urethane oligomer/monomer blend and a tripropylene glycol diacrylate. The mixture is combined with an isobornyl acrylate, a &bgr;-Carboxyethyl acrylate, a photoinitiator, and an N-vinyl-2-pyrrolidone. A composition for making a small scale submaster optical component includes an ultraviolet polymarizing varnish and a surfactant.

Abstract: The invention relates to a pressure-sensitive adhesive tape with improved room temperature handleability comprising an adhesive layer with at least one exposed surface and optionally a backing, wherein the pressure-sensitive adhesive layer comprises an epoxy/polyester based pressure sensitive adhesive which is crosslinkable upon exposure to actinic or e-beam irradiation and optionally heat, and comprises (i) 30-80% by weight of a polyester component comprising one or more amorphous polyesters compounds, (ii) 20-70% by weight of an epoxy component comprising one or more epoxy resins and/or monomers, (iii) 0-50% by weight of a hydroxyl-functional component containing one or more hydroxyl-containing compounds having a hydroxyl functionality of at least 1, and (iv) an effective amount of a photoinitiator component for crosslinking the pressure-sensitive adhesive, whereby the weight percentages refer to the total mass of components (i)-(iv) and add up to 100 wt.

Abstract: The invention relates to a photosensitive resin composition for rapid prototyping comprising: a. about 30 wt. % to about 70 wt. % of at least two epoxy resins, at least one of these resins is solid at room temperature and comprises aromatic groups, and at least one of these resins is liquid, having a viscosity at 25° C. lower than about 1,000 Pa.s, b. about 15 wt. % to about 50 wt. % of at least one multifunctional acrylate compound c. about 5 wt. % to about 30 wt. % of a hydroxyfunctional compound d. about 1 wt. % to about 6 wt. % cationic photoinitiator e. about 1 wt. % to about 6 wt. % free radical photoinitiator. The invention further relates to a process for the manufacturing of 3-dimensional objects, known as rapid prototyping, wherein the photosensitive resin composition is used.

Abstract: This invention is of a resin composition including an additive of one or more organic peroxide thermal imitators to cationic photoinitiators, that are sensitized with alpha-hydroxy-ketones, which composition provides a self-propagating thermal curing reaction first activated by a short duration of surface ultraviolet radiation. The thermal reaction is non-directional, thus eliminating the line of sight limitation of current radiation curing processes. Complete curing can be achieved of the composition in a very short time; often after only a few minutes or less. The activation period can be provided by only a few seconds of ultraviolet light using a wide variety of commercial ultraviolet light sources.

Abstract: The present invention is directed to polymerizable dental compositions containing a) 3 to 80 wt. % of cycloaliphatic epoxides; b) 0 to 80 wt. % of an epoxide or a mixture of epoxides which are different from a); c) 3 to 85 wt. % of a filer material; d) 0.01 to 25 wt. % of initiators, inhibitors and/or accelerators; e) 0 to 25 wt. % of auxiliary agents, the individual percentages of which are in relation to the total weight. The new polymerizable agents are particularly suited as dental material.

Abstract: Disclosed are compounds of the formulas which are useful as monomers in photopolymerizable compositions. Also disclosed are methods of polymerizing these monomers, and polymers produced thereby.

Abstract: A curing process for cationically polymerisable monomers, which comprises applying a composition comprising: (a) at least one cationically polymerisable monomer, (b) as photoinitiator at least one iodonium salt containing an SbF6, PF6 or BF4 anion, (c) one pigment, and (d) at least one sensitiser, to a substrate, irradiating it with light having a wavelength of 200-600 nm and then heat-postcuring it, is distinguished by little yellowing of the cured formulation.

Abstract: The present invention relates to monomers and polymers prepared therefrom, which are suitable for forming photoresist compositions employed in lithography processes using a deep ultraviolet light source, in particular an ArF light source. According to the present invention, novel monomers represented by Chemical Formula 1, are provided: wherein R represents a C1-C10 alkyl group, and m is the number 1 or 2. as well as copolymers prepared by using said monomers as represented by Chemical Formula 8: wherein R represents a C1-C10 alkyl group; R′ represents H or —COOH; m is the number 1 or 2; n is a number from 1 to 3; and X represents CH2, NH or O; and a, b and c represent the number of repeating of the respective monomers.

Abstract: An actinic radiation curable, cationic polymerizable, ink and coating composition having greatly enhanced reactivity, and reduced viscosity and are low in odor comprised of an aqueous solution containing a cationic polymerizable compound such as an cycloaliphatic epoxy compound, a water compatible hydroxy functional cyclic ether compound, particularly, an epoxy or oxetane compound, and water.

Abstract: A thermosetting pressure-sensitive adhesive which can obtain the high rate of polymerization without a decrease in the molecular weight by photopolymerization, thereby show the tackiness at ordinary temperatures to permit easy temporary adhesion to an adherend, can be cured by heating for a short period of time to exhibit strong adhesive strength and high heat resistance, and is excellent in storage stability before heating, comprising a photopolymerized product of a composition comprising a) 100 parts by weight of a monomer mixture comprising 70% to 99% by weight of an alkyl (meth)acrylate whose alkyl group has 2 to 14 carbon atoms on average, and 1% to 30% by weight of a monoethylenic unsaturated acid copolymerizable therewith based on the monomer mixture, b) 0.

Abstract: The specification describes optical fiber coating materials and methods for making optical fiber gratings wherein the material of the optical fiber coatings comprises vinyl ether functionalized monomers, together with oligomeric or polymeric thickeners and a cationic photoinitiator. These coating materials are highly transparent to UV radiation used to write optical gratings in the optical fibers but still absorb sufficiently at other wavelengths to be cured effectively using UV radiation.

Abstract: Photocurable, addition polymerizable compositions contain an epoxy resin and a photoinitiator system containing (a) an epoxy resin, (b) a hydroxyl containing material and (c) a photoinitiator system comprising: (i) an iodonium salt; (ii) a visible light sensitizer; and (iii) an electron donor compound, wherein the photoinitiator system has a photoinduced potential of at least about 100 mV relative to a standard solution of 2.9×10−5 moles/g diphenyl iodonium hexafluoroantimonate and 1.5×10−5 moles/g camphorquinone in 2-butanone. The compositions cure on exposure to light in the visible spectrum and are useful in a variety of applications, including dental adhesives and composites.

Abstract: Photopolymerizable compositions that include free radically active and cationically active functional groups, and methods for polymerizing such compositions, in which the onset of cationic polymerization is controllably delayed to extend the time between formation of a moldable gel and formation of a hardened solid.

Abstract: Disclosed herein is a game ball, such as a golf ball, having an indicia formed from a UV curable ink containing aluminum trihydroxide (ATH) filler. The ATH improves pad transfer of the ink. An ink composition suitable for pad printing, and a method for applying an indicia to a game ball also are disclosed. The UV curable ink has excellent pad transfer properties, and good durability.

Abstract: A UV curable, flexible, paintable composition is disclosed. The disclosed composition has enhanced durability, thick and thin film adhesion, resistance to mold growth and dimensional changes while reducing solvent emissions. The disclosed composition reduces, if not eliminates, runs and drips during the thermal bake cycles which are associated with using conventional compositions in automotive applications.

Abstract: A cationically polymerizable pigmented composition comprising (A) a cationically polymerizable binder component containing at least one resin or compound selected from the group consisting of (A-1) a cationically polymerizable acrylic resin consisting of a copolymer of (a) a (meth) acrylic ester monomer having C.sub.6-31 aliphatic hydrocarbon group, (b) a polymerizable unsaturated monomer containing a polymerizable unsaturated group and at least one cationically polymerizable moiety selected from the group consisting of an epoxy group and an oxetane ring, and optionally (c) other polymerizable unsaturated monomer, and (A-2) a fatty acid-modified epoxy compound containing C.sub.6-32 aliphatic hydrocarbon group and epoxy group, (B) a cationic polymerization initiator initiating polymerization by irradiation or heating, and (C) a color pigment.

Abstract: There is disclosed an ultraviolet-curing coating composition for cans comprising (A) 10-85 parts by weight of a compound having alicyclic epoxy group(s) in the molecule, (B) 5-60 parts by weight of a compound having an oxetane ring of a specific structure, (C) 5-60 parts by weight of a compound having an oxetane ring and hydroxyl group in the molecule, (D) 5-60 parts by weight of a compound having either at least two oxetane rings or oxetane ring(s) and epoxy group(s) in the molecule, and (E) 0.01-20 parts by weight of a cation-polymerization initiator, which generates a cation when irradiated with ultraviolet rays, per 100 parts by weight of the total amount of the compounds (A), (B), (C) and (D); and a process for producing a coated metal can by coating this coating composition and curing by irradiation with ultraviolet rays.

Abstract: In a first aspect, a method for treating hard tissue that includes: (a) applying to hard tissue a composition that includes a cationically active functional group, a free radically active functional group, and a polymerization initiator capable of initiating free radical polymerization, where the number of moles of cationically active functional groups per gram of composition is no greater than about 0.0075; and (b) exposing the composition to polymerization conditions to form an adhesive bonded to the hard tissue.

Abstract: Disclosed herein is a game ball, such as a golf ball, having an indicia formed from a UV curable ink containing aluminum trihydroxide (ATH) filler. The ATH improves pad transfer of the ink. An ink composition suitable for pad printing, and a method for applying an indicia to a game ball also are disclosed. The UV curable ink has excellent pad transfer properties, and good durability.

Abstract: A one-component epoxy resin for coverage of bare chips and for underfilling of flip chips is disclosed. Two polyol components are combined in the inventive epoxy resin which decidedly improve the properties of the resin with respect to coefficient of expansion, shrinkage stress, substrate adhesion, and reactivity.

Abstract: This invention provides a UV curable powder coating composition comprising a particulate blend of a non-crystalline unsaturated polyester base resin, a crystalline unsaturated crosslinker resin co-polymerizable with the base resin, and a photoinitiator, that exhibits reduced or eliminated hazing in the cured coating formed therefrom upon being cured at low temperatures demanded by certain heat sensitive substrates. This is accomplished by incorporating in the powder composition a recrystallization or haze inhibitor which is comprised of a crystalline epoxy resin. When this powder blend is melted for curing, the crystalline crosslinker resin visually appears to separate and recrystallize out of the molten powder less completely than it does in the absence of the recrystallization or haze inhibitor. This prevents a visible haze from developing on the surface of the coating upon curing with UV radiation.

Abstract: The present invention provides compositions comprising epoxy-containing monomers, where the polymerization of the monomers can be influenced by accelerators. The compositions include at least one photo-polymerizable epoxy monomer and an initiation system. The initiation system comprises at least one organo-iron complex salt and at least one accelerator. The epoxy-containing monomers are energy-polymerized to form useful articles or coated articles.

Abstract: A novel photo-curable resin composition. The resin composition capable of providing a cured product having excellent mechanical strength, high dimensional accuracy, and excellent toughness. The resin composition is capable of providing a cured product which experiences little change in mechanical strength over time. The resin composition is capable of forming, by photo-fabricating, a three-dimensional object which can be used for a long period of time in a humid atmosphere. The composition comprises, (A) an epoxy compound having a cyclohexene oxide, (B) a cationic photo-initiator, (C) an ethylenically unsaturated monomer, (D) a radical photo-initiator, and (E) a polyol.

Abstract: The invention relates to a composition comprising polymerizable material and an anionic photocatalyst. The photocatalyst is a photolabile compound able to liberate a strong base having a pK.sub.a .gtoreq.12. The catalyst can be illustrated by the structural formula Z-A wherein Z is a photolabile group and A is a strong base, for example, a nitrogen containing compound such as, a secondary amine, a guanidine or amidine and Z is covalently bound to A.

Abstract: The invention relates to a thermochromic polymerizable mesogenic composition essentially consisting of:a) a component MA comprising at least one achiral polymerizable mesogenic compound comprising at least one polymerizable functional group,b) a component MB comprising at least one chiral polymerizable mesogenic compound comprising at least one polymerizable functional group,c) a photoinitiator, andd) optionally a dye component,to anisotropic polymers and polymer films with a chiral mesophase obtainable from said thermochromic polymerizable mesogenic composition and to the use of said thermochromic polymerizable mesogenic composition, anisotropic polymers and polymer films for optical information storage, photomasks, decorative pigments, cosmetics, security applications, active and passive optical elements such as polarizers or optical retarders, color filters, scattering displays, adhesives or synthetic resins with anisotropic mechanical properties.

Abstract: A method for preparing a film suitable for use as the light-modulating unit of an SPD light valve, which film comprises a cross-linked polymer matrix having droplets of a liquid light valve suspension distributed in the cross-linked polymer matrix. The light valve suspension comprises particles suspended in a liquid suspending medium. The method comprises admixing a UV cross-linkable liquid oligomer or polymer and the liquid light valve suspension, emulsifying the resulting admixture to form an emulsion of the liquid light valve suspension in the UV cross-linkable liquid oligomer or polymer, and cross-linking the UV cross-linkable liquid oligomer or polymer while the mixture is in the form of a thin layer of the emulsion by exposing the layer to UV radiation or to an electron beam, such that the film is not damaged due to such exposing. The oligomer or polymer and the particles are free of deleterious effects on one another.

Abstract: A coating composition for forming a transparent, abrasion-resistant coating upon eyeglass lenses or other transparent substrates, the composition comprising a binder component and a curing agent component and being substantially free of volatiles. The binder component comprises the hydrolysis product of an epoxy-functional alkoxy silane, a polyglycidyl ether, and an acrylic monomer having an acrylic functionality of not more than two. The curing agent component comprises a cationic photoinitiator and a free radical photoinitiator.

Abstract: A novel method for producing thick composite parts based upon photopolymerizable compositions is disclosed. Also disclosed are novel methods for encapsulation of microelectronic devices based upon novel photopolymerizable compositions. The constituents of the photopolymerizable mixture comprise a monomer or monomers capable of polymerizing by free radical or cationic mechanisms, and a photoinitiator system which possesses an absorbance characteristic which is effectively reduced, or self-eliminating, upon initiation of the polymerization reaction. Parts having thicknesses up to 2 cm and thicker for varying end use applications are made by photopolymerizing such compositions. In addition, using such compositions composite parts can be made using a reinforcement material such as a glass fiber mat present in an amount by weight of from about 5 to about 70%.

Abstract: A photo-curable resin composition capable of providing a three-dimensional object having excellent mechanical strength and high dimensional accuracy when used in a photo-fabrication process. The resin composition is also capable of providing a three-dimensional object with excellent stability in shape and properties in a photo-fabrication process. The photo-curable composition includes:(A) a compound represented by the formula (1) ##STR1## wherein R.sup.1 and R.sup.2 independently represent a hydrogen atom or a methyl group;(B) a compound having a cyclohexene oxide structure;(C) a cationic photo-initiator;(D) an ethylenically unsaturated monomer;(E) a radical photo-initiator; and(F) a polyol having three or more hydroxyl groups.

Abstract: Dye compounds of the formula ##STR1## wherein X is for example CH, C--CH.sub.3 or .sup.+ NOR L.sup.- ; R is inter alia C.sub.1 -C.sub.6 alkyl; R.sub.1 is for example C.sub.1 -C.sub.8 alkoxy or C.sub.1 -C.sub.12 alkyl; s is 0 to 4; R.sub.2 is for example hydrogen; Ar is for example a group ##STR2## Y inter alia is C.sub.1 -C.sub.6 alkyl or C.sub.1 -C.sub.6 alkoxy; r in the formula (A) is 0 to 5, in the formulae (B) and (E) is 0 to 9 and in the formula (D) is 0 to 7; and L is an anion;in combination with an electron donor compound, especially a borate compound, are suitable as photoinitiators for the photopolymerization of radically polymerizable compositions.

Abstract: The present invention is to provide curable compositions usable appropriately in coatings, adhesives, photoresists, etc. and directed to sulfonium salt compounds represented by general formula [I]; ##STR1## wherein R.sub.1 and R.sub.2 represent alkyl, hydroxy, alkoxy, alkylcarbonyl, aromatic carbonyl, aromatic thio or halogeno; R.sub.3 represents alkyl; R.sub.4 represents optionally substituted alkyl, alkenyl or cycloalkyl; m and n are each 0, 1, 2 or 3; and X represents a non-nucleophilic anionic residue; a cationic polymerization initiator containing the compound; and a curable composition which contains the compound and a cationically polymerizable compound optionally together with a sensitizer.

Abstract: The present invention relates to a sizing composition for glass threads which comprises a solution of a viscosity of less than or equal to 400 cP containing less than 5% by weight of solvent and containing at least one base system which can be polymerised under the action of ultraviolet radiation or an electron beam, the said base system comprising at least one component that has a molecular mass of less than 750 and that has at least one reactive epoxy group and comprising at least 60% by weight of one or more components that have a molecular mass of less than 750 and that have at least one reactive group selected from the following groups: epoxy, hydroxy, vinyl ether, acrylic and methacrylic.The invention relates also to a process using this composition and to the threads coated with the said composition.

Abstract: Compounds of formula (I), ##STR1## wherein X is CH, C--CH.sub.3, C--Cl, C--O--C.sub.1 -C.sub.8 alkyl or N; R is C.sub.1 -C.sub.6 alkyl, benzyl, CH.sub.2 COOR.sub.3 or a group (a); R.sub.1 is C.sub.1 -C.sub.8 alkoxy, C.sub.1 -C.sub.12 alkyl, halogen, NO.sub.2, benzyloxy or phenyloxy, wherein the phenyl ring in the benzyloxy or phenyloxy group is unsubstituted or substituted by C.sub.1 -C.sub.6 alkoxy, C.sub.1 -C.sub.12 alkyl, halogen or CF.sub.3 ; R.sub.2 is C.sub.1 -C.sub.8 alkoxy, C.sub.1 -C.sub.12 alkyl, benzyloxy or phenyloxy, wherein the phenyl ring in the benzyloxy or phenyloxy group is unsubstituted or substituted by C.sub.1 -C.sub.6 alkoxy, C.sub.1 -C.sub.12 alkyl, halogen or CF.sub.3 ; R.sub.3 is hydrogen, C.sub.1 -C.sub.12 alkyl or benzyl; Y is unsubstituted or C.sub.1 -C.sub.6 alkoxy-substituted C.sub.1 -C.sub.6 alkyl, or Y is C.sub.1 -C.sub.6 alkoxy, halogen, CF.sub.3, NO.sub.2, benzyloxy or phenyloxy, wherein the phenyl ring in the benzyloxy or phenyloxy group is unsubstituted or substituted by C.

Abstract: The invention relates to compositions which undergo cationic curing with visible light, comprising:(a) 0.01 to 8 wt. % of at least one diaryliodonium compound,(b) 0.01 to 8 wt. % of at least one .alpha.-dicarbonyl compound,(c) 10.0 to 99.9 wt. % of at least one compound containing epoxide groups and/or oxetane groups,(d) 0 to 85 wt. % of modifiers, such as fillers, dyestuffs, pigments, flow improvers, thixotropic agents, polymeric thickeners, additives having an oxidizing action, stabilizers and retardants, characterized in that they additionally comprise(e) 0.001 to 5 wt. % of at least one aromatic amine.The compositions have a low intrinsic color, cure with little smell and, after curing, give compositions with very good mechanical properties.

Abstract: Compounds of formula I, II or III ##STR1## X is a divalent radical; Y is C.sub.1 -C.sub.6 aklylene, cyclohexylene or a direct bond;Ar.sub.1 is an aromatic radical as defined in claim 1,R.sub.1 and R.sub.2 are each independently the other, inter alia, a radical of formula ##STR2## in which p is zero or 1, or a radical of formula ##STR3## R.sub.3 is, inter alia, hydrogen, C.sub.1 -C.sub.12 alkyl, C.sub.5 -C.sub.12 cycloalkyl or phenyl-C.sub.1 -C.sub.3 alkyl;R.sub.4 is, inter alia, C.sub.1 -C.sub.12 cycloalkyl, phenyl-C.sub.1 -C.sub.3 alkyl or phenyl;or an acid addition salt of a compound of formula I, II or III;are useful as photosensitive base catalysts in base crosslinking compositions.

Abstract: This invention provides an energy ray curable composition which has excellent curability. The composition contains a cationic polymerizable substance, a photopolymerization initiator comprised of a specified onium salt and a pigment as occasion demands. The curable composition is excellent in curability, and cured paint films obtained therefrom shows excellent glossiness. This composition can be blended in white inks, printing inks, paints, resist inks, wood fillers and the like.

Abstract: The present invention relates to polymer precursors used in sterolithography. Specifically, the invention provides a novel resin having a glass transition temperature (Tg) that is substantially higher than any existing resins. The polymer precursors comprise an admixture of at least one vinyl ether, functionalized compound and at least one epoxy functionalized compound, at least one acrylate functionalized compound, and a photoinitiator, wherein the polymer precursor composition cures by a dual cure mechanism utilizing a free radical pathway as well as a cationic pathway thus yielding improved green strength.

Abstract: The invention relates to a radiation curable primary coating composition for coating an optical fiber, composed of a component having a first end and a second end, a saturated aliphatic backbone, and at least one epoxide group at the first end of the component, and at least one reactive functional group at the second end; a mixture of acrylate monomers, composed of a first monomer having one acrylate group, and a second monomer having at least two acrylate groups; and a photoinitiator. The invention further relates to a radiation curable primary coating composition for coating an optical fiber, composed of a component having a first end and a second end, a saturated aliphatic backbone, and at least one epoxide group at the first end of the component, and at least one reactive functional group at the second end; a mixture of acrylate monomers, composed of a first monomer having one vinyl ether group, and a second monomer having at least two vinyl ether groups; and a photoinitiator.

Abstract: Photocurable, addition polymerizable compositions contain an epoxy resin and a photoinitiator system containing (a) an epoxy resin and (b) a photoinitiator system comprising: (i) an iodonium salt; (ii) a visible light sensitizer; and (iii) an electron donor compound, wherein the photoinitiator system has a photoinduced potential of at least about 0 mV relative to a standard solution of 2.9.times.10.sup.-5 moles/g diphenyl iodonium hexafluoroantimonate and 1.5.times.10.sup.-5 moles/g camphorquinone in 2-butanone. The compositions cure on exposure to light in the visible spectrum and are useful in a variety of applications, including dental adhesives and composites.

Abstract: A resin composition for three-dimensional object by optical stereolithography containing a colorant, such as carbon black, in an amount of 0.05 to 0.5% by weight can provide a colored three-dimensional object which has excellent physical and mechanical properties such as dimensional accuracy, shape stability, hardness and tensile strength and elastic modulus in tension, as well as light-shielding properties, gives a massive impression and is colorful at a high optical shaping speed and in a good productivity.